Quantum QMTWO - Receiver ESX - Free user manual and instructions

Product type	Amplified receiver / Power amplifier
Brand	ESX
Model	Quantum QMTWO (QM-TWOV2)
RMS output power (14.4 V)	2 x 105 W @ 4 Ω 2 x 150 W @ 2 Ω 1 x 300 W @ 4 Ω (bridged)
Max output power (14.4 V)	2 x 210 W @ 4 Ω 2 x 300 W @ 2 Ω 1 x 600 W @ 4 Ω (bridged)
Speaker impedance	2 - 8 Ω (stereo)
Frequency response	5 - 40 000 Hz (-3 dB)
Total harmonic distortion	< 0.5 % (1 kHz)
Signal-to-noise ratio	> 90 dB
Input sensitivity	0.3 - 12 V
Input impedance	100 kΩ
Filters	High-pass / Low-pass : 50 - 250 Hz @ 12 dB/octave
Power supply	+12 V (9 - 15 V), negative ground
Fuse	1 x 20 A (external, included)
Dimensions (W x H x D)	75 x 33 x 120 mm
Weight	0.5 kg (estimated)
Audio inputs	RCA (L/R) + high-level input (HIGH LEVEL INPUTS)
Speaker outputs	2 stereo channels or 1 bridged channel
Special functions	Auto turn-on (AUTO TURN ON), stereo/mono mode, sensitivity adjustment
Maintenance	Clean with a dry cloth; avoid moisture and solvents
Safety	External fuse; professional installation recommended; observe impedances
Spare parts	Fuse 20 A (standard reference)
Repairability	Repair possible by a qualified technician

Frequently Asked Questions - Quantum QMTWO ESX

What is the RMS power of the Quantum QMTWO?

The RMS power is 2 x 105 W @ 4 Ω, 2 x 150 W @ 2 Ω, and 1 x 300 W @ 4 Ω in bridged mode (at 14.4 V).

How to connect the amplifier to a car radio without RCA output?

Use the high-level input (HIGH LEVEL INPUTS) with an adapter cable. Set the INPUT switch to HIGH. Do not use RCA and high-level inputs simultaneously.

What type of fuse is needed?

A 20 A external fuse is included. It must be placed within 30 cm of the battery on the +12 V cable.

How to adjust input sensitivity?

Set the car radio volume to halfway, then turn the INPUT LEVEL control until you get a medium sound level without distortion.

Can I use the amplifier with a subwoofer alone?

Yes, in bridged mode: connect the subwoofer between the two channels (e.g., L+ and R-). Set the X-OVER switch to LPF and adjust the cutoff frequency (50-250 Hz).

How does auto turn-on work?

The amplifier detects a 6 V DC offset on the high-level input when the car radio turns on. It then turns on automatically without needing the REM wire. Works with 90% of modern sources.

What to do if the amplifier does not turn on?

Check the external fuse, ground connection (clean, on bare metal), voltage at +12 V terminal (9-16 V), and the REM wire (or AUTO TURN ON function).

How to avoid engine noise?

Keep audio cables (RCA) away from power cables. Use clean grounds and a second battery-chassis ground wire if necessary. Check the alternator and spark plugs.

What is the minimum speaker impedance?

In stereo: 2 Ω per channel. In bridged mode: 4 Ω. Do not go below, otherwise damage the amplifier.

Where to install the amplifier in the car?

In a well-ventilated place, protected from vibrations, dust, and moisture. The trunk is recommended. Do not place it in a closed unventilated space.

USER MANUAL Quantum QMTWO ESX

Please read the user's manual carefully before the installation and the first operation of the amplifier.

SPECIFICATIONS	QM-TWOv2
Output Power RMS @ 14,4 V	2 x 105 W @ 4 Ohms 2 x 150 W @ 2 Ohms 1 x 300 W @ 4 Ohms bridged
Output Power Max. @ 14,4 V	2 x 210 W @ 4 Ohms 2 x 300 W @ 2 Ohms 1 x 600 W @ 4 Ohms bridged
Loudspeaker impedance (stereo)	2 - 8 Ohm
Frequency Response	5 - 40 000 Hz (-3 dB)
Total Harmonic Distortion	< 0,5 % (1 kHz)
Signal-to-Noise Ratio	> 90 dB
Input Sensitivity	0,3 - 12 V
Input Impedance	100 kOhm
High Pass Filter / Low Pass Filter	50 - 250 Hz @ 12 dB/Octave
Operating Voltage	+12 V (9 - 15 V), negative ground
Fuse Rating	1 x 20 A (external, included in delivery)
Dimensions (B x H x L)	75 x 33 x 120 mm
All Specifications are subject to change

IMPORTANT NOTES PRIOR TO INSTALLATION

• This device is only suited for a 12 volt system with negative ground.
• The radiated heat while operation requires sufficient air circulation at the place of installation. It is very important that the heatsink fins do not have contact with any metal parts or any surfaces which could impair air circulation. The amplifier may not be installed in small closed location or spaces without air circulation (e.g. spare wheel recess or below the vehicle carpeting). We recommend the installation in the vehicle's trunk. Ensure sufficient protection against vibrations, dust and dirt.
• Ensure that the input and output cables are sufficiently separated from the power supply cables. Otherwise interferences may occur.
• Ensure the accessibility of the fuse and the operating elements after installation.
• The reliability and performance of the amplifier depends on the quality of installation. Preferably consult an expert to install the system, particularly if you want to install several loudspeakers.

INTERCONNECTION

POWER SUPPLY AND TURN-ON-CONNECTION

ATTENTION: Before you start with the installation, disconnect the ground connection from the vehicle's battery in order to prevent short circuits.

The power wiring which is usually installed in on-board car networks is not sufficient for a power amplifier's demands. Make sure that the power wires to GND and to the +12V terminal has been sufficiently specified. A cable cross section of at least 4mm^2 must be used to connect the battery to the amplifier's terminals.

First connect the GND terminal of the amplifier to an appropriate ground connection at the chassis. To ensure a good connection, residue dirt and dust from the connection point. A loose connection may cause malfunctions or interferences noise and distortion.

Then connect the +12V terminal of the amplifier with the battery by using an appropriate cable including an in-line fuse. This fuse should be located very close to the battery; for safety reasons not more than 30~cm away. Only insert the fuse when the installation, including the connection of the loudspeakers, has been accomplished.

Then connect the remote turn-on-wire from the head unit with the amplifier's REM terminal. A cable with a cross-section of 0.5mm^2 is adequate.

LOUDSPEAKER CONNECTIONS

In 2-channel operation (i.e. one loudspeaker on each amplifier channel), the impedance must not be lower than 2 ohms for each speaker
In bridging mode (two amplifier outputs combined) the impedance must not be lower than 4 ohms.
- Never connect loudspeaker cables with the ground of the chassis or the +12V supply voltage.

If the amplifier is operated with a too low impedance or incorrectly used, the entire sound system may be damaged. This means a warranty void in such cases.

AUDIO SIGNAL CABLES

When installing the audio cables between the RCA outputs of the head unit and the RCA inputs of the amplifier, the audio and power supply cables should, if possible, not be routed along the same side of the vehicle. We recommend a separated installation, e.g. routing the power cable through the cable channel on the left side and the audio cables through the cable channel of the vehicle on the right side or vice versa. This prevents interferences due to crosstalk into the audio signal.

HIGH LEVEL INPUTS

The HIGH LEVEL INPUTS (Fig. 1,5) is suitable to connect the device input with speaker wires, if your head unit is not equipped with pre-amplifier RCA outputs. Extend therefor every regarding speaker cable from your head unit with appropriate speaker cables from your car audio retailer to the mounting location of the amplifier. Then connect the each matching loudspeaker cable with the cables of the included HIGH LEVEL INPUT jack and set the switch INPUT (Fig. 1,6) to position HIGH.

CAUTION: Never use the HIGH LEVEL INPUTS and the RCA inputs at the same time. This may damage the device seriously. The loudspeaker cables of the HIGH LEVEL INPUT must have no contact to the ground (GND) by any means.

AUTO TURN ON

The amplifier detects a voltage rise (6 Volts) with a so called "DC Offset" over the connected input signal on the HIGH LEVEL INPUTS (Fig. 1,5) when the head unit will be switched on. Hence, the amplifier will also be turned on. As soon as the head unit will be turned off, the amplifier turns also automatically off. In this case the turn-on connection (REM, Fig. 2,1) is not needed.

NOTE: The Auto Turn On function usually works with 90% of all head units, because they are equipped with "High Power"-outputs. Only with a few older and still existing head units the Auto Turn On function is not working.

OPERATING ELEMENTS

INPUT SENSITIVITY

Turn the INPUT LEVEL (Fig. 1,3) controller of the amplifier to the MIN position. Then turn the volume controller of the head unit to 80 - 90% of its full setting. Now turn INPUT LEVEL clockwise until you hear some distortion. Then turn back the INPUT LEVEL slightly until you hear a cleaner sound.

VARIABLE HIGH PASS FILTER

If the amplifier is to be used for mid-range/tweeter loudspeakers, set the switch X-OVER (Fig. 1,2) to HPF. Then set the desired cross-over frequency on the FREQUENCY controller (Fig.1,1). Thus to that only the frequencies above the chosen cross-over frequency will be amplified. This effectively minimizes distortions and overloads at lower frequencies. A good point to start is at 125Hz .

If you use loudspeakers (>20cm) set X-OVER (Fig.1,2). to "OFF". In this case, the FREQUENCY controller is without function (Fig.1,1).

VARIABLE LOW PASS FILTER

If the amplifier is used to drive a subwoofer, set the switch X-OVER (Fig. 1,2) to "LPF". Set the desired crossover frequency by using the FREQUENCY controller (Fig. 1,1). Thus to that only the frequencies below the chosen cross-over frequency will be amplified and the subwoofer plays more precisely and efficient.

FIGURES (P. 28-30)

CONNECTIONS AND CONTROLLER (FIG. 1)

(1) High Pass / Low Pass filter controller
(2) Selector HPF (High Pass) - OFF - LPF (Low Pass)
(3) Input level controller
(4) Audio signal inputs (L & R)
(5) High level inputs for speaker wires, coming from the head unit

POWER SUPPLY AND TURN ON CONNECTION (FIG. 2)

(1) REM terminal for the turn on connection
(2) +12V terminal for the positive-connection of the battery
(3) GND terminal for the ground
(4) Vehicle's battery
(5) In-Line Fuse (external, included in delivery)
(6) Turn on wire from the head unit or the electrical antenna

2-CHANNEL OPERATION STEREO (FIG. 3)

If you want to run the amplifier with the 2 line output channels from the head unit to drive 2 loudspeakers, in stereo connect the following setup:

(1) To the head unit, line output left
(2) To the head unit, line output right
(3) Loudspeaker left
(4) Loudspeaker right

1-CHANNEL OPERATION MONO (FIG. 4)

If you want to run the amplifier with the 2 line output channels from the head unit to drive a subwoofer, connect the following setup:

(1) To the head unit, line output left or subwoofer output
(2) To the head unit, line output right or subwoofer output
(3) Subwoofer

IMPORTANT!

Always observe the correct polarity of all connections!

TROUBLESHOOTING

If you are having problems after installation follow the Troubleshooting procedures below.

Procedure 1:

Check amplifier for proper connections.

1. Check in-line fuse on battery positive cable. Replace if necessary.
2. Verify that Ground connection is connected to clean metal on the vehicle's chassis. Repair/replace if necessary.
3. Verify there is 9 to 16 Volts present at the positive battery and remote turn-on cable.
4. Verify quality connections for both cables at amplifier, head unit, and battery/fuse holder. Repair/replace if necessary.

Procedure 2:

Check amplifier for overload and short circuits.

1. Check for proper speaker connections and use an ohm meter to check for possible shorts in the speaker wiring.
2. Too low speaker impedance may also overheat and overload. Shut off the system and allow amplifier to cool down.
   3 Check that the vehicle charging system is maintaining proper voltage. If the previous items do not solve the problem, a fault may be in the amplifier. In this case you should contact your dealer.

Procedure 3:

Check amplifier for audio output.

1. Verify good RCA input connections at head unit and amplifier. Check entire length of cables for kinks, splices, etc. test RCA inputs for AC volts with head unit on. Repair/replace if necessary.

Procedure 4:

Check amplifier for a popping noise while turning on.

1. Disconnect input signal to amplifier and turn amplifier on and off.
2. If the noise is eliminated, connect the remote lead of amplifier to source unit with a delay turn-on module.

Procedure 5:

Check amplifier if you experience excess engine noise.

1. Route all signal carrying wires (RCA, speaker cables) away from power and ground wires.

OR

1. Bypass any and all electrical components between the head unit and the amplifier(s). Connect head unit directly to input of amplifier. If noise goes away the unit being bypassed is the cause of the noise.

OR

1. Remove existing ground wires for all electrical components. Reground wires to different locations. Verify that grounding location is clean, shiny metal free of paint, rust etc.

OR

1. Add secondary ground cable from negative battery terminal to the chassis metal or engine block of vehicle.

OR

1. Have alternator and battery load tested by your mechanic. Verify good working order of vehicle electrical system including distributor, spark plugs, spark plug wires, voltage regulator etc.

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